Sumita Pandit
Analyst · KBW
Thank you, Rick, and good afternoon to you all. We started the year with another strong quarter of operating results, producing net income in the first quarter of 2024 of $152 million or $0.98 per diluted share compared to $0.91 per diluted share in the fourth quarter of '23. Adjusted diluted net operating income per share was slightly higher than the GAAP metric at $1.03 for the first quarter compared to $0.96 for the previous quarter.
We generated a 14% annualized return on equity in the first quarter, which helped to grow our book value per share 12% year-over-year to $29.30. This book value per share growth is in addition to our regular stockholder dividends, which were $37 million during the quarter, reflecting our previously announced increased quarterly dividend of $0.245 per share. We also repurchased $50 million of our shares during the first quarter, demonstrating our commitment to returning excess capital and enhancing value for our stockholders.
Turning now to the detailed drivers of our results. Our revenues continue to be strong in the first quarter of '24. We generated $319 million of total revenues during the quarter, a 3% year-over-year increase. Slides 10 through 12 in our presentation include details on our mortgage insurance in Force portfolio as well as other key factors impacting our net premiums earned.
Our primary mortgage insurance imports grew 4% year-over-year to an all-time high of $271 billion as of the end of the first quarter, generating $234 million in net premiums earned in the quarter. Contributing to the growth of our insurance in Force was $11.5 billion of new insurance written in the first quarter of '24 compared to $10.6 billion written during the fourth quarter of '23.
While higher interest rates continue to provide a headwind for new originations, it has also significantly benefited the persistency rate of our existing insurance in Force which remained high at 84% in the first quarter based on the trailing 12 months compared to 82% a year ago.
We provide more detail on our persistency trends on Slide 10. We expect our persistency rate to remain strong given current mortgage rates and the overall economic outlook. As of the end of the first quarter, 85% of our insurance in Force had a mortgage rate of 6.5% or less. Given current mortgage interest rates, which meaningfully exceed these levels, along with the expectation that rates will stay higher for longer, these policies are less likely to cancel due to refinancing in the near term.
As shown on Slide 12, the In Force premium yield for our mortgage insurance portfolio remained stable in the quarter as expected at 38.2 basis points. With strong persistency rates and the current positive industry pricing environment, we expect our in-force portfolio premium yield to remain stable for the remainder of the year as well. The benefits we are experiencing in this higher interest rate environment from high persistency rates and investment income, which I'll discuss next, help demonstrate the durability of our mortgage insurance business model in varied interest rate environments.
Our net investment income grew 18% year-over-year to $69 million in the first quarter. The rise in our net investment income has been driven by increases over the past year in both the size and the average yield of our investment portfolio. As we continue to reinvest cash flows in the higher rate environment, we expect our average investment portfolio yield and quarterly net investment income to increase further throughout 2024, further illustrating the benefits of a higher rate environment to our financial results.
Our unrealized net loss on investments reflected in stockholders' equity was $362 million at quarter end. We expect that our strong liquidity and cash flow position will provide us with the ability to hold these securities to recovery of the unrealized losses, which would equate to $2.39 that is expected to accrete back into our book value per share over time.
I will now move on to our provision for losses. Credit trends continue to be extremely positive. Once again in the first quarter of '24, our defaults continue to cure at rates greater than our previous expectations, resulting in releases of prior period results that in recent years have significantly offset reserves established for new defaults. Our favorable loss experience continues to be driven primarily by the significant embedded homeowner equity resulting from the strong home price appreciation experienced in recent years.
On Slide 16, we provide trends for our primary default inventory. Our primary default inventory declined by approximately 1,000 loans during the first quarter to approximately 21,000 loans at quarter end, as cures outpaced new defaults, representing a portfolio default rate of 2.1% at March 31, 2024, a decline from 2.2% in the prior quarter.
I would like to highlight a new disclosure that we have included on Slide 17, which details the progression of cumulative cures for each quarterly new default cohort over the past several years. As shown on that slide, our cure trends have been very consistent and positive in recent periods, with approximately 90% of defaults curing within 4 quarters and 97% curing within 8 quarters, meaningfully exceeding our initial expectations.
And during the first quarter of 2024, we had the highest quarterly cure rate in more than 20 years as measured by the number of cures in the quarter compared to the beginning default inventory. The number of new defaults reported to us by services was approximately 11,800 in the first quarter of '24, a decline of 6% from the previous quarter. We continue to maintain our default-to-claim roll rate assumption for new defaults at 8% which, combined with a slightly lower clean severity assumption resulted in $54 million of loss provision for new defaults reported during the quarter.
Positive reserve development on prior period defaults of $61 million more than offset this provision for new defaults due to the favorable cure trends just discussed as well as the benefit from lower claim severity trends. As a result, we recognized a net benefit of $7 million in our mortgage insurance provision for losses in the first quarter.
I will now discuss a segment reporting change related to Homegenius. Whereas previously, we had aggregated our title, real estate services and real estate technology businesses, as a separate reportable segment named Homegenius. Effective this quarter, we are including the results of these businesses in our all other category. This change reflects the way we manage and evaluate these businesses individually and incorporates materiality considerations consistent with current accounting guidance. It also aligns with the presentation of our mortgage conduit business, which we also report in all other, along with holding company investment income.
As a result of our ongoing expense savings efforts, our combined consolidated cost of services and other operating expenses were $92 million in the first quarter of 2024, a year-over-year decrease of $2 million or 2% compared to the first quarter of '23. While we continue to actively manage our operating expenses and seek opportunities for additional efficiencies, it is important to note that these expenses can fluctuate from quarter-to-quarter due to changes in items such as variable incentive compensation. And similar to prior years, we do expect expenses to be elevated in the second quarter of '24 due primarily to the timing of our annual share-based incentive trends.
Moving to our capital available liquidity and related strategic actions. The financial position of our primary operating subsidiary, Radian Guaranty remains strong. Radian Guaranty's excess PMIERs available assets over minimum required assets, remained stable during the first quarter at $2.3 billion. That PMIERs cushion was after taking into account an additional $100 million ordinary dividend paid by Radian Guaranty to Radian Group in the first quarter, its fifth consecutive quarterly dividend of $100 million.
As we have noted previously, Radian Guaranty's ordinary dividend capacity is driven by its statutory unassigned funds balance each period. We have added a new schedule to Slide 21, to show the drivers of unassigned funds in more detail. This schedule highlights the role of contingency reserve releases and supporting our quarterly dividends as they help offset new reserves we established each quarter.
Now that Radian Guaranty is releasing these reserves in material amounts. We expect the size of the quarterly ordinary dividend payments to increase beginning in the second quarter. This is consistent with our previously provided expectation for Radian Guaranty to pay $400 million to $500 million of ordinary dividends to Radian Group during 2024.
During the first quarter of 2024, we completed the first steps to address upcoming debt maturities, which extended the term of our senior notes outstanding. With our plan to pay down the 2024 senior notes later this year, Radian will have no senior note debt due until 2027, lowering leverage, interest expense and overall debt outstanding by year-end. We issued $625 million of unsecured senior notes at an attractive coupon of 6.2% in a well-received investment-grade debt offering during the quarter and used a portion of the proceeds to fully redeem $525 million of our higher coupon 6.625% senior notes that had been scheduled to mature in March '25.
We intend to use the balance of the funds raised along with available holding company liquidity to pay off our $450 million of senior notes that mature in October of 2024. We expect to reduce our holding company debt to capital ratio to below 20% following the retirement of the senior notes later this year.
Additionally, we repurchased 1.8 million shares during the first quarter at a total cost of $50 million. As of the end of the first quarter, our current share repurchase authorization had $117 million remaining and expires in January 2025. As demonstrated by this past quarter's repurchase activity and our track record in recent years, we believe that share repurchases provide an attractive option to deploy our excess capital.
As a result of the net impact of these first quarter activities, our available holding company liquidity increased to approximately $1.1 billion at the end of the first quarter. We also have an undrawn credit facility with borrowing capacity of $275 million, providing us with significant financial flexibility.
I will now turn the call back over to Rick.